Population Dynamics and Spatial Distribution of Coral Reef Fishes: Comparison Between Continuous and Isolated Habitats View Full Text


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Article Info

DATE

2003-10

AUTHORS

Atsushi Nanami, Moritaka Nishihira

ABSTRACT

Recent studies have shown that there are high degrees of spatial and temporal stability in coral reef fish assemblage structures in a continuous habitat, in contrast to results of observations in isolated habitats. In order to determine the reason for the difference in temporal stability of fish assemblage structures in a continuous habitat site and an isolated habitat site, population dynamics and spatial distributions of coral reef fishes (six species of pomacentrids and two species of apogonids) in the two habitat site were investigated over a 2-year period in an Okinawan coral reef. The population densities of pomacentrid and apogonid species increased in juvenile settlement periods at both sites, but the magnitude of seasonal fluctuation in population density was significantly greater at the isolated habitat site, indicating that the rate of juvenile settlement and mortality rate in the isolated habitat were greater than those in the continuous habitat. The magnitude of aggregation of fishes, which affects density-dependent biological interactions that modify population density such as competition and predation, was also significantly greater at the isolated habitat site, especially in the juvenile settlement season. Most of the fishes at the isolated habitat site exhibited more generalized patterns of microhabitat selection because of less coral coverage and diversity. The seasonal stability in the species composition of fishes was greater at the continuous habitat site than that at the isolated habitat. Our findings suggest that the relative importance of various ecological factors responsible for regulation of the population density of coral reef fishes (e.g., competition, predation, microhabitat selection and post-settlement movement) in a continuous habitat site and the isolated habitat site are different. More... »

PAGES

101-112

References to SciGraph publications

  • 1997-06. Relationships between coral reef substrata and fish in CORAL REEFS
  • 1980-09. Assemblages of fish on patch reefs — predictable or unpredictable? in ENVIRONMENTAL BIOLOGY OF FISHES
  • 2002-04. The Structures and Dynamics of Fish Communities in an Okinawan Coral Reef: Effects of Coral-based Habitat Structures at Sites with Rocky and Sandy Sea Bottoms in ENVIRONMENTAL BIOLOGY OF FISHES
  • 1992-12. Spatial and temporal variation in predation on reef fishes by coral trout (Plectropomus leopardus, Serranidae) in CORAL REEFS
  • 1994-06. Ecological structure of assemblages of coral reef fishes on isolated patch reefs in OECOLOGIA
  • 1981-12. Spatial and temporal patterns of recuruitment of juvenile coral reef fishes to coral habitats within “One Tree Lagoon”, great barrier reef in MARINE BIOLOGY
  • 1993-05. Habitat structure, conspecific presence and spatial variation in the recruitment of a temperate reef fish in OECOLOGIA
  • 1995-04. Effects of microhabitat characteristics on the settlement and recruitment of a coral reef fish at two spatial scales in OECOLOGIA
  • 1996-08. Variations in mortality of a coral-reef fish: links with predator abundance in MARINE BIOLOGY
  • 1998-02. Is recruitment of the temperate sand goby,sagamia geneionema, affected by habitat patch characteristics? in ICHTHYOLOGICAL RESEARCH
  • 1978-12. Analysis of the influence of substrate variables on coral reef fish communities in MARINE BIOLOGY
  • 1995-08. Strong density-dependent survival and recruitment regulate the abundance of a coral reef fish in OECOLOGIA
  • 1997-09. Population regulation by post-settlement mortality in two temperate reef fishes in OECOLOGIA
  • 2000-08. Interactions Between Habitat Use and Patterns of Abundance in Coral-dwelling Fishes of the Genus Gobiodon in ENVIRONMENTAL BIOLOGY OF FISHES
  • Journal

    TITLE

    Environmental Biology of Fishes

    ISSUE

    2

    VOLUME

    68

    Author Affiliations

    Identifiers

    URI

    http://scigraph.springernature.com/pub.10.1023/b:ebfi.0000003799.77382.de

    DOI

    http://dx.doi.org/10.1023/b:ebfi.0000003799.77382.de

    DIMENSIONS

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